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Tip and Trick Detail
Using Commands Transparently
*Applies to: AutoCAD R12, 13, 14, 2000, 2000i, 2002, 2004 and 2005*

Have you ever taking a close look at what command is being launched at the command line when you start up new commands?  Have you ever noticed that some have an Apostrophe ( ' ) in the front?  These commands are what AutoCAD refers to as a Transparent command.  These commands can be run while other commands are still active, like the LINE and CIRCLE commands.  Below are couple examples of how you can use these commands.

Command Line:
Command: line
From point: 'zoom
>>Press Esc or Enter to exit, or right-click to activate pop-up menu.
Resuming LINE command.
From point:
To point:
To point:

Command Line:
Command: circle
3P/2P/TTR/<Center point>: 'ddosnap
Resuming CIRCLE command.
3P/2P/TTR/<Center point>: Diameter/<Radius>:

Below is an example of a command that can't be used Transparently and the message that is displayed.

Command Line:
Command: 'xref
** That command may not be invoked transparently **